caa a22 4500 445814810 CHVBK 20180317145223.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10040-011-0751-0 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0751-0 Ferruginous thermal spring complexes, northwest Tasmania: evidence that far-field stresses acting on a fracture mesh can open and maintain vertical flow in carbonate terrains [Elektronische Daten] [Garry Davidson, Michael Bavea, Kathryn Harris] Complexes de sources ferrugineuses, Tasmanie du Nord-Est: preuve manifeste qu'un champ distant de contraintes agissant sur un maillage de fractures peut établir et entretenir un flux vertical en terrain carbonaté Far-field stress changes in the southern Australian plate since 5 Ma have produced significant areas of uplift and seismicity. In northwest Tasmania, there is evidence that this stress reorientation to maximum horizontal NW-SE stress has influenced meteoric-derived thermal (15-20°C) discharge patterns of confined karstic aquifers, by placing pre-existing NW-trending faults/fractures into a dilated state or a critically stressed state. Previous studies have shown that spring discharge has operated continuously for at least 65,000 years, and has transported large volumes of solutes to the surface to be deposited as mounds of calcite-goethite-silica up to 7 m high. The thermal spring chemistry at one site, Mella, is consistent with descent to at least 1.2-1.5 km, although the hinterland within 50 km is less than 500 m elevation. Thermal spring chemistry is consistent with most of the deep water-rock interaction occurring in low-strontium Smithton Dolomite. While some of this water is discharged at springs, some instead intersects shallow zones of NE-fracture-controlled rock (2×4 km in area) with karstic permeability where, although confined and subject to a NE-directed hydraulic gradient, it circulates and cools to ambient temperature, with only minor mixing with other groundwaters. Springer-Verlag, 2011 Thermal springs nationallicence Karst nationallicence Far field stress nationallicence Hydrogeochemistry nationallicence Tasmania nationallicence Australia nationallicence Davidson Garry ARC Centre for Excellence in Ore Deposits, School of Earth Sciences, University of Tasmania, Private Bag 79, 7001, Hobart, Tasmania, Australia aut Bavea Michael c/ Bernat Tallaferro 11, 08328 Alella, Barcelona, Spain aut Harris Kathryn 43 Grove Cres., 4066, Toowong, Queensland, Australia aut Hydrogeology Journal Springer-Verlag 19/7(2011-11-01), 1367-1386 1431-2174 19:7<1367 2011 19 10040 https://doi.org/10.1007/s10040-011-0751-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0751-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Davidson Garry ARC Centre for Excellence in Ore Deposits, School of Earth Sciences, University of Tasmania, Private Bag 79, 7001, Hobart, Tasmania, Australia aut NATIONALLICENCE 700 1- Bavea Michael c/ Bernat Tallaferro 11, 08328 Alella, Barcelona, Spain aut NATIONALLICENCE 700 1- Harris Kathryn 43 Grove Cres., 4066, Toowong, Queensland, Australia aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/7(2011-11-01), 1367-1386 1431-2174 19:7<1367 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer